[got2surf]

Even worn paths through the grass at university/corporate campuses can show better ideas for sidewalk layout.

[nlawalker]

https://en.wikipedia.org/wiki/Desire_path

[nathancahill]

https://www.reddit.com/r/DesirePath/

[setr]

Illinois institute of technology's main building (mtcc) was designed based on that: they tracked people as they crossed over the large lawn (park?) to get to classses and such, and then built the building so as to preserve those paths